EP2056542A1 - Übertragungsleistungsmaske für Schnellzugriffsanfragen - Google Patents

Übertragungsleistungsmaske für Schnellzugriffsanfragen Download PDF

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Publication number
EP2056542A1
EP2056542A1 EP07021132A EP07021132A EP2056542A1 EP 2056542 A1 EP2056542 A1 EP 2056542A1 EP 07021132 A EP07021132 A EP 07021132A EP 07021132 A EP07021132 A EP 07021132A EP 2056542 A1 EP2056542 A1 EP 2056542A1
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EP
European Patent Office
Prior art keywords
mobile station
transmission power
fast access
access message
time slot
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EP07021132A
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English (en)
French (fr)
Inventor
David Edward Dr. Cooper
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Panasonic Corp
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Panasonic Corp
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Priority to EP07021132A priority Critical patent/EP2056542A1/de
Publication of EP2056542A1 publication Critical patent/EP2056542A1/de
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
    • H04W52/281—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission taking into account user or data type priority
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • the invention relates to a transmission power mask to be applied to the transmission of fast access message in the uplink of a mobile communication system. Furthermore, the invention relates to a method and mobile station for sending a fast access message and a base station for configuring the transmission power mask to be applied to the transmission of fast access message in the uplink of a mobile communication system.
  • the GSM (originally from Groupe Spécial Mobile) radio system (and its extension to GPRS) employs "time division duplexing" to ensure that the radio transceiver in the mobile station is not required to transmit and receive simultaneously. This simplifies the design of the radio.
  • This "time division duplexing" is achieved by dividing available time into "time-slots", some of which are assigned for the purpose of radio transmission and some for reception. As illustrated in Fig. 1 , there are 8 timeslots in each TDMA frame of a GSM system. The slot used for transmission is separated from the slot used for reception by a time interval of two slots.
  • Fig. 1 also illustrates the convention for slot numbering; the numbering of reception (Rx) slots and transmission (Tx) slots ensures that the same "slot number" is used in both downlink and uplink (in the example below, slot 0).
  • the GPRS system is an extension of the basic GSM system which is used for so-called "packet switched" communications. It allows an increased data rate during packet data transfer by using more than one timeslot either for transmission or reception.
  • Fig. 2 illustrates an exemplary TDMA frame structure of a GPRS system where, in this particular example, two slots are used for transmission and one for reception.
  • GPRS allows the number of uplink slots and downlink timeslots to vary according to constraints determined by the mobile and the availability of free timeslots.
  • data is transmitted in both directions between the base station and a mobile on Packet Data Channels (PDCHs).
  • PDCHs Packet Data Channels
  • Each PDCH uses a single slot, i.e. a slot with the same index, in successive TDMA frames, and a mobile station can use one or more PDCHs. In the example shown in Fig. 2 , two PDCHs would be required.
  • GPRS transmits data in units called a 'radio block', where one radio block is contained in four successive timeslots of a physical channel, i.e. in the same timeslot in 4 successive TDMA frames.
  • This concept of a GPRS radio block is shown in Fig. 3 , where the physical channel is exemplarily illustrated on the timeslot with index 2 (timeslot 2). This structure is common to radio blocks in the downlink and uplink.
  • EGPRS Enhanced Data rates for GSM Evolution
  • EGPRS Enhanced GPRS
  • EGPRS functions on any network with GPRS deployed on it, provided the carrier implements the necessary upgrade.
  • GMSK Gaussian minimum-shift keying
  • 8PSK 8 phase shift keying
  • EGPRS and GPRS utilize a rate adaptation algorithm that adapts the modulation and coding scheme (MCS) according to the quality of the radio channel and thereby the bit rate and robustness of data transmission.
  • MCS modulation and coding scheme
  • E GPRS supports this both for uplink or downlink communications, using a method referred to as 'dynamic allocation'.
  • the base station When a (E)GPRS connection is created, the base station 'assigns' one or more PDCHs to each mobile station, indicating which slots the PDCHs are on. Since resources can be shared between different mobiles, the action of 'assigning' a PDCH does not indicate that the mobile is allowed to use the PDCH.
  • TFI temporary flow identity
  • the base station transmits a "USF" (Uplink State Flags) on the downlink to indicate which uplink timeslots a given mobile is allowed to transmit on during the next radio block - the PDCH is said to be 'allocated' to that particular mobile for the duration of the next radio block.
  • a USF is transmitted along with other data during each radio block. All interested mobiles (i.e.
  • the USF can take 8 values, of which one value is reserved, so in principle the channel can be shared by 7 mobiles.
  • the USF is transmitted by the BTS on a given radio block to indicate which mobile is allowed to transmit on the uplink in certain indicated channels during the subsequent radio block. Only the indicated mobile may transmit in the given channels during the subsequent frame.
  • This method for uplink multiplexing can lead to significant delays before a mobile station providing a speech or voice service can access the uplink during a 'speech silence' period. Even if the speech mobile has nothing to send, the base transceiver station (BTS) polls it regularly by sending a USF which indicates the speech mobile, since the end of the silent period cannot be predicted. The result of such a poll is that no other mobiles can use the channel during the next radio block, even if the speech mobile has nothing to send.
  • BTS base transceiver station
  • the BTS (also referred to as base station) could poll the speech mobile infrequently, but in that case when speech resumes there would be a severe delay.
  • the BTS polls the speech mobile one half of the time (thus wasting 50% of uplink resources during a silent period).
  • the speech mobile station MS can transmit again to indicate that it has some data to send. This corresponds to approximately 40 ms, an undesirable period of delay.
  • the base station controller BSC
  • One main aspect of the invention is the definition of a new transmission power mask that is applied to uplink transmissions from a mobile station.
  • the mobile stations may utilize this transmission power mask for transmitting a fast access message; that is an uplink message utilized by a mobile station to request the allocation of an assigned uplink resource (for example one or more timeslots in a Time Division Multiple Access (TDMA) based system) that is presently allocated to another mobile station.
  • TDMA Time Division Multiple Access
  • the transmission power mask defines at least two different transmission power levels that are to be applied to the uplink transmission during a time slot.
  • the transmission power mask is designed to avoid interference with parallel transmissions of other mobile terminals in the same time slot.
  • the transmission power mask indicates a zero transmission power level for the portion or portions of the time slot in which another mobile station may transmit encrypted bits of user data.
  • the transmission power mask indicates a non-zero transmission power for a portion of the duration of the time slot that is coinciding with at least a part of a training sequence of a burst of data transmitted by another mobile station within the same time slot, and a zero transmission power for the remaining portion of the time slot.
  • the transmission power mask is designed specifically for use in a GSM based communication system. Accordingly, the transmission power mask may indicate a non-zero transmission power within the time slot for a time duration equal or smaller than the time duration of 26 bits or modulation symbols of a normal burst of a GSM based mobile communication system. Alternatively, in another example, the transmission power mask indicates a non-zero transmission power within the time slot for a time duration equal or smaller than the 31 symbols of the training sequence of a high symbol rate burst of a GSM based mobile communication system.
  • the duration of a time slot for which the mobile station utilizes a non-zero transmission power is depending on the actual position and duration (in bits or modulation symbols) of the training sequence in a burst potentially transmitted by another mobile station in parallel to the fast access message.
  • Another embodiment of the invention relates to a method for reducing interference caused by a fast access message within a mobile communication system utilizing TDMA for dividing physical resources at a given transmission frequency into individual time slots.
  • a given number of time slots forms a so-called frame, and one or more time slots of a frame is/are assigned for potential use to mobile stations (for example a first and a second mobile station) to transmit via a traffic channel.
  • the base transceiver station (base station) of the communication system may temporarily allocate the time slot or the time slots on the uplink for use by the second mobile station.
  • To request the (re)allocation of the time slot to the first mobile station same transmits a fast access message within the time slot temporarily allocated for use by the second mobile station.
  • the first mobile station applies the before-mentioned transmission power mask to the transmission of the fast access message thereby utilizing zero transmission power for the transmission of those portion or portions of the fast access message potentially coinciding with a transmission of encrypted bits of user data by the second mobile station within the time slot.
  • the second mobile station may transmit a burst of data within the time slot temporarily allocated to the second mobile station, wherein the burst of data comprises a training sequence and the encrypted bits of user data.
  • the first mobile station utilizes a non-zero transmission power for at least a portion of the transmission of the fast access message that is coinciding with the transmission of the training sequence within the burst of data by the second mobile station in said time slot.
  • the transmission power mask is indicating a non-zero transmission power for a portion of the duration of the time slot that is not coinciding with at least a part of the training sequence within the burst of data transmitted by the second mobile station, and is indicating zero transmission power for the remaining portion of the time slot.
  • the time slot temporarily allocated to the second mobile station is (re)allocated to the first mobile station by a base station. This (re)allocation is made in response to receiving the fast access message at the base station.
  • the burst of data transmitted by the second mobile terminal within the time slot may for example be a normal burst or a high symbol rate burst of a GSM system.
  • the normal burst or high symbol rate burst comprise tail bits, encrypted bits for user data, the training sequence and a guard period.
  • the transmission power mask may for example indicate zero transmission power for the portion or portions of the time slot in which another mobile station may transmit encrypted bits for user data.
  • data is transmitted in form of so-called radio blocks that consist of a given number of time slots in successive frames.
  • the fast access message may be comprised in a radio block being transmitted utilizing this given number of time slots in successive frames.
  • the first mobile terminal applies the transmission power mask to each time slot carrying the radio block comprising the fast access message.
  • a plurality of predefined data sequences is defined and the fast access message consists of different ones of the predefined data sequences.
  • the first mobile station transmits one of said predefined data sequences forming the fast access message, for example, in a cyclic manner.
  • the predefined data sequences have a minimal correlation with a normal burst or a high data rate burst of a GSM based communication system.
  • the first mobile station and/or the second mobile station receive from a base station an indication of the duration of the time period within the time slot in which the transmission power for transmitting the fast access message is non-zero.
  • the invention also provides a mobile station for use within a mobile communication system.
  • the mobile station comprises a transmitter for transmitting a fast access message in the time slot temporarily allocated to another mobile station so as to request (re)allocation of the time slot to the mobile station.
  • the mobile station applies a transmission power mask to the transmission of the fast access message thereby utilizing zero transmission power for the transmission of those portion or portions of the fast access message potentially coinciding with a transmission of encrypted bits of user data by the second mobile station within the time slot.
  • the mobile station may also comprise a receiver for receiving from a base station an indication of a duration of the time period within the time slot in which the transmission power for transmitting the fast access message is non-zero.
  • the mobile station further comprises a processor for estimating multi-path fading experienced by downlink transmissions on the traffic channel and for determining a duration of the time period within the time slot in which the transmission power for transmitting the fast access message is non-zero based on the estimation of the multi-path fading on the traffic channel.
  • the fast access message may be for example comprised in a radio block being transmitted utilizing a given number of time slots in successive frames.
  • the mobile terminal may apply the transmission power mask to each time slot carrying the radio block comprising the fast access message.
  • a plurality of predefined data sequences is defined and the fast access message consists of at least two of these predefined data sequences.
  • the mobile station may transmit one of said at least two predefined data sequences in each time slot of said given number of time slots carrying the fast access message.
  • Another embodiment of the invention relates to a base station for configuring a transmission power mask indicating different transmission power levels within a time slot that are to be applied to the transmission of a fast access message by a mobile station.
  • the base station comprises a transmitter for transmitting an indication of a duration of the time period within the time slot in which the transmission power for transmitting the fast access message is non-zero.
  • the base station further comprises comprising a processor for estimating multi-path delay experienced by uplink transmissions on the traffic channel.
  • the processor is further used to determine a duration of the time period within the time slot in which the transmission power for transmitting the fast access message is non-zero based on the estimation of the multi-path fading on the traffic channel.
  • another embodiment of the invention relates to a mobile communication system utilizing the transmission power mask according to one of the different embodiments described herein.
  • a further embodiment of the invention relates to a mobile communication system comprising a mobile station and/or a base station according to on of the different embodiments described herein.
  • the invention according to a further embodiment relates to a computer readable medium storing instructions that, when executed by a processor of the mobile terminal cause the mobile terminal to reduce interference caused by a fast access message within a mobile communication system utilizing TDMA for dividing physical resources at a given transmission frequency into individual time slots.
  • This is by the instructions causing the first mobile station to recognize the fact that the base station temporarily allocated said time slots on the downlink for use by the second mobile station, and to transmit a fast access message within said time slot temporarily allocated for use by the second mobile station, wherein the fast access message is for requesting reallocation of the time slot on the uplink by the first mobile station.
  • the instruction further cause the first mobile station to apply a transmission power mask to the transmission of the fast access message thereby utilizing zero transmission power for the transmission of those portion or portions of the fast access message potentially coinciding with a transmission of encrypted bits of user data by the second mobile station within the time slot.
  • the computer readable medium further stores instructions that, when executed by the processor of the mobile station, cause the mobile terminal to receive from a base station an indication an indication of a duration of the time period within the time slot in which the transmission power for transmitting the fast access message is non-zero.
  • the computer readable medium additionally stores instructions that, when executed by the processor of the mobile station, cause the mobile terminal to estimate multi-path fading experienced by downlink transmissions on the traffic channel and to determine a duration of the time period within the time slot in which the transmission power for transmitting the fast access message is non-zero based on the estimation of the multi-path fading on the traffic channel.
  • the computer readable medium further stores instructions that, when executed by the processor of the mobile station, cause the mobile terminal to apply the transmission power mask to each time slot carrying a radio block comprising the fast access message.
  • the computer readable medium may store instructions that, when executed by the processor of the mobile station, cause the mobile terminal to transmit one of predefined data sequences in each time slot of said given number of time slots carrying the fast access message.
  • Another embodiment of the invention is related to a computer readable for storing instructions that, when executed by a processor of a base station, caused the base station to configure a transmission power mask indicating different transmission power levels within a time slot that are to be applied to the transmission of a fast access message by a mobile station, by transmitting an indication of a duration of the time period within the time slot in which the transmission power for transmitting the fast access message is non-zero.
  • this computer readable medium further stores instructions that, when executed by the processor of the base station, cause the base station to estimate multi-path fading experienced by downlink transmissions on the traffic channel and to determine a duration of the time period within the time slot in which the transmission power for transmitting the fast access message is non-zero based on the estimation of the multi-path fading on the traffic channel.
  • the invention described herein may be used in a GSM-based communication system, and in particular the invention may be implemented in GPRS and EGPRS based communication systems as for example known from 3GPP TS 43.064, "GSM/EDGE Radio Access Network;General Packet Radio Service (GPRS); Overall description of the GPRS radio interface;Stage 2 (Release 7)", version 7.6.0, available at http://www.3gpp.org and incorporated herein by reference.
  • 3GPP TS 43.064 "GSM/EDGE Radio Access Network;General Packet Radio Service (GPRS); Overall description of the GPRS radio interface;Stage 2 (Release 7)", version 7.6.0, available at http://www.3gpp.org and incorporated herein by reference.
  • GPRS allows the multiplexing of several mobiles on a single 'physical channel' resource (i.e. specific timeslot with particular frequency hopping sequence).
  • the base station (BTS) controls the multiplexing both in the uplink and downlink direction, and makes the decision about which mobile will use the resource during each radio block.
  • the base station is the transmitter on the downlink and is also responsible for the multiplexing decision. Therefore, the base station selects which mobile it will transmit data to and marks this data with an address which uniquely indicates the target mobile.
  • data can be sent to other mobiles. When voice activity resumes, there need be no delay in sending downlink frames to the speech user.
  • the base station not know when the period of speech silence ends. In the current GPRS system it must regularly 'poll' the speech mobile during speech gaps in case speech frames are now ready to send. This means that it allocates the speech mobile uplink resources whether it needs them or not, in order that the mobile can transmit a frame to indicate that speech has resumed. This is clearly wasteful, and also subject to undesirable delays: either the base station polls the speech mobile frequently, which wastes uplink resources with 'no data' responses, or it polls it infrequently, in which case speech resumption is delayed.
  • the invention described herein utilizes the ideas described in EP 1 435 746 A1 , and, according to one embodiment of the invention, makes use of the "common predetermined access message” and "fast access request” (both summarized in the term “fast access message” herein).
  • the invention suggests a specific transmission power mask for utilization in the transmission of the fast access message.
  • the different aspects of the invention include the proposal of a new transmit burst structure to contain this fast access message to ensure that interference with uplink data is minimized and the proposal of a method of mitigating any co-channel interference caused by the fast access message, which relies using a fixed set of "fast access training sequences" which vary in a deterministic way from burst to burst.
  • one main aspect of the invention is the definition of a new transmission power mask.
  • the transmission power mask specified herein is not foreseeing a non-zero transmission power level over the time span of the duration of a burst transmitted during a time slot.
  • the transmission power mask proposed herein defines at least two different transmission power levels that are to be applied to the uplink transmission during a time slot.
  • the transmission power mask proposed herein is designed to avoid interference with parallel transmissions of other mobile terminals in the same time slot.
  • the transmission power mask indicates a zero transmission power level for the portion or portions of the time slot in which another mobile station may transmit encrypted bits of user data, and indicates a non-zero transmission power level for the portion or portions of the time slot in which another mobile station does not transmit encrypted bits of user data.
  • zero transmission power means or 'power off' condition of the transmitter means that residual output power is maintained at, or below, the level of -54 dBm.
  • non-zero transmission power or 'power on' condition of the transmitter means that the residual output power of the transmitter is higher than this threshold value, and for example corresponds to a transmission power level commanded by the base station.
  • the transmission power mask may not be implemented as to switch between power levels in a single time instance (as may be also recognized in 3GPP TS 45.005, Annex B) - instead the illustrations of the proposed transmission power masks are actually a simplified representation of the transmission power mask.
  • the burst format of the burst transmitted during a time slot comprise a training sequence (e.g. at the centre of the burst) and another portion or portions comprising encrypted bits of user data.
  • the transmission power mask to be applied to the transmission of the fast access message is indicating a non-zero power level only for the duration of the time slot that is coinciding with a potential simultaneous transmission of the training sequence, and indicates a zero transmission power for the portion(s) of the time slot in which another mobile station potentially transmits its user data in form of encrypted bits. As illustrated in Fig.
  • the fast access message itself may have a time duration equivalent to the length of the training sequence and its position in the time slot may be centred on the training sequence of the potential parallel transmission of the training sequence in a time slot (which typically corresponds to the middle of the time slot for burst in GSM systems).
  • the fast access message has a longer duration than the training sequence, e.g. equivalent to the time slot (including tail bits and guard bits), so that the proposed transmission power mask "mutes" the bits of the fast access message not coinciding with the training sequence of a potential transmission burst of another mobile station in the same time slot.
  • the fast access message is designed so as to have minimum correlation with parallel transmissions. If the length of the fast access message is similar to the length of the training sequence, the fast access message should be designed to have minimum correlation with the training sequence potentially contained in a parallel transmission burst.
  • the fast access message may be thus considered a known signal having minimum correlation with the known training sequence which all mobiles in the same cell use on the uplink.
  • those bits of the fast access message for which the transmission power mask indicates a zero transmission power will not contribute to interference with a parallel transmission burst. Accordingly, the design of these bits may be arbitrarily chosen, e.g. all zeros or a random bit sequence.
  • the fast access message is identifying the mobile station sending the message.
  • Fig. 4 shows the transmit power time mask for the normal burst as defined in 3GPP TS 45.005, Annex B, alongside the structure of the normal burst (see 3GPP TS 45.002, "Technical Specification Group GSM/EDGE; Radio Access Network; Multiplexing and multiple access on the radio path (Release 7)", version 7.5.0, section 5 (available at http://www.3gpp.org and incorporated herein by reference)).
  • the transmitter is in the 'power off' condition.
  • the mobile should transmit at the requested power. Note that this figure is simplified and does not show allowed level and time tolerances, for which it is referred to the full description in 3GPP TS 45.005.
  • Fig. 5 illustrates an exemplary new transmit power time mask for a fast access message according to one embodiment of the invention. Similar to Fig. 4 , it is assumed that another mobile station than that sending the fast access message is transmitting in parallel a normal burst.
  • the "useful part" of the normal burst consists of two portions of encrypted user data ("encrypted bits") and a training centre consisting of a known bit sequence in the centre of the burst.
  • the normal burst and the fast access message are supposed to be transmitted (in parallel) in a single time slot on a traffic channel (in the uplink).
  • An exemplary fast access message is illustrated below the normal burst format.
  • the fast access message may be defined as for example in the EP 1 435 746 A1 , i.e. the fast access message may for example also comprise of 148 bits.
  • the fast access message should at least comprise the same number of bits as the training sequence in the parallel transmission burst.
  • the transmission power mask is only "non-zero" during the time duration equal to 26-T bits, where T may be considered training sequence reduction factor, being a natural number equal or larger than 0.
  • T may be considered training sequence reduction factor, being a natural number equal or larger than 0.
  • time axis used in the figure is from the perspective of the base station, i.e. after any time of flight from the mobile station to the base station (which may differ from the transmission timing of the mobile stations).
  • the reduction factor may take into account the multipath fading delay of the uplink signals so as to assure that the fast access message will not interfere with the user data portions of the parallel transmission burst of another mobile station in situations where there is fading present on the transmission channel.
  • the mobile station may for example adjust the transmitted power when T is non-zero to maintain the same total transmit energy as for the case where T is zero, thus ensuring that detectability is not impaired.
  • the value T would be calculated by the base station, which is best placed to estimate the amount of multipath spreading, and signalled to the mobile station.
  • the mobile station could observe the multipath spreading on the downlink and adjust T on the assumption that the amount of multipath spreading observed by the base station on the uplink is likely to be similar.
  • the transmitter circuitry of the mobile station sending the fast access message uses the commanded power level only during a portion of the time slot that is coinciding with the training sequence, so that outside the time occupied by the training sequence the transmitter circuitry is turned off.
  • the fast access message only interferes with the training sequence of any uplink transmission from another mobile on the same timeslot. Since this training sequence is known, the fast access message can consist of a fixed sequence which is optimized to interfere minimally with the training sequence as proposed in EP 1 435 746 A1 .
  • Fig. 6 illustrates another exemplary new transmit power time mask for a fast access message according to one embodiment of the invention, which is essentially similar to the example shown in Fig. 5 .
  • the example shown in Fig. 6 considers the case of a parallel transmission of higher symbol rate burst as also specified in 3GPP 45.002, section 5.
  • the higher symbol rate burst is transmitted by the mobile stations using a higher order modulation scheme than the GMSK modulation used for the normal burst, so that more user data may be transmitted in a single burst.
  • the training sequence of the higher data rate burst covers 31 bits in time. Accordingly, the non-zero transmission power level duration of the transmission power mask according to this exemplary embodiment may be enlarged to 31-T bits, where T is the before mentioned reduction factor.
  • a fast access message may not only span a single time slot but may be transmitted in a given number of consecutive time slots in subsequent frames.
  • the fast access message may be transmitted on the uplink during the four bursts of a radio block.
  • the transmit power time mask proposed herein may be applied to each of these four bursts carrying the fast access message.
  • Another aspect of the invention is to mitigate co-channel interference with adjacent base stations.
  • it is possible to identify fixed data sequences for the fast access message which interfere minimally with the training sequence used at the base station there is still the problem that the fast access message may produce unwanted interference at adjacent base stations.
  • it is not possible to design a fixed data sequence which has uniformly low correlation with the training sequences at adjacent base stations since the time of flight to the adjacent base station is unknown. Therefore there is a danger that if a fixed data sequence is used as a fast access message, it will generate undesired interference at an adjacent base station.
  • EP 1 435 746 A1 there exists a set of fixed data sequences which have the desired interference properties at the wanted base station.
  • Another embodiment of the invention proposes that a set of such fixed data sequences is used in a cyclic manner.
  • the fast access message is transmitted during the time slots of a radio block (e.g. 4 consecutive bursts of a radio block)
  • each burst of the fast access message could for example use a different element of this repertoire of fixed data sequences.
  • no signal which members to use may be needed: since the repertoire is fixed for each training sequence, all that is required is a convention for indexing and ordering the different members of the set of data sequences, and they can then be used in a known pre-determined sequence of which both transmitter (mobile station) and receiver (base station) are aware. Accordingly, even if utilizing different sequences to represent the fast access message, no additional signalling overhead may be implied.
  • Fig. 7 illustrates the parallel transmission of a fast access message by a first mobile station (mobile station #1) and a burst by a second mobile station (mobile station #2) according to an exemplary embodiment of the invention.
  • time axis used in the figure is from the perspective of the base station, i.e. after any time of flight from the mobile station to the base station (which may differ between mobile stations).
  • both mobile stations have been assigned to a common time slot on of an uplink traffic channel to transmit to a base station.
  • the base station has allocated the time slot to the second base station, e.g. by an appropriate setting of the USF flag in a downlink transmission.
  • the communication system may provide discontinuous transmission (DTX) to optimally utilize resources in the communication system. Accordingly, the time slot assigned to both mobile stations is allocated for use to the second mobile station during a speech pause of the user of the first mobile station.
  • DTX discontinuous transmission
  • the first mobile station may desire to be (re)allocated the assigned time slot, e.g. as the user has continued to speak. Though the time slot on the traffic channel is still allocated the second mobile station, the first mobile station may send a fast access message in the assigned time slot in the next frame. Similarly, the second mobile station may have user data pending for transmission, so that it is going to transmit a normal burst in the assigned and allocated time slot to the base station. Accordingly, the second mobile station transmits its burst in the allocated time slot applying the transmission power mask to the normal burst as has been exemplified with respect to Fig. 4 . The second mobile station also generates a burst comprising (a part of) the fast access message, e.g.
  • the first mobile station applies the proposed transmit power mask to its transmission burst, so that the transmitting circuitry only outputs transmission power during those portion(s) of the time slot that is coinciding (in time) with the transmission of the training sequence of the normal burst transmitted by the second mobile station.
  • the first mobile station applies the transmission transmit power reduction factor so that the transmission power mask utilizes a non-zero transmission power for a time duration shorter than the duration of the transmission of the training sequence in the normal burst within the time slot.
  • the reduction faction may be for example configured by the first mobile station in response to receiving a corresponding control signalling from the base station that is indicating the multipath fading delay.
  • the first mobile station may also estimate the multipath fading delay and may adapt the reduction factor to be used for the transmission power mask of the fast access message accordingly.
  • the base station may signal the training sequence reduction factor to the first mobile station.
  • this is done using a new or and an extension to existing signalling messages on the PACCH channel, as for example described in 3GPP TS 44.060 "General Packet Radio Service (GPRS); Mobile Station (MS) - Base Station System (BSS) interface; Radio Link Control/Medium Access Control (RLC/MAC) protocol (Release 7)", version 7.10.0, chapter 11, available at http://www.3gpp.org, incorporated herein by reference.
  • This reduction factor may be signalled as a newly defined optional field within the control message used to control timing advance, e.g.
  • the "Packet Power Control/Timing Advance" message which is sent periodically by the base station to each individual mobile to control its transmit power and the timing advance.
  • a bit field consisting of 3 bits would allow the base station to signal a reduction of 0 to 7 bit periods in the length of the transmission power mask. If this bit field is not present in this signalling message, then the most recently signalled value is used. If no value has been yet supplied the value "0" is used.
  • the training sequence reduction factor is signalled to the first mobile station using a field within the "Packet Power Control/Timing Advance" message where the field has the following format: ⁇ 0
  • the fast access message may be regarded as a pre-emptive signal to re-request the allocation of a PDCH (Physical Data Channel) to the requesting mobile station.
  • PDCH Physical Data Channel
  • AB Access Burst
  • the design of the access burst and its transmit power mask is made in view of the need to ensure that the whole of the access burst is within the correct timeslot when it arrives at the base station, provided that the time of flight between the mobile station and the base station is less than the duration of 60 bits periods (this corresponds to a maximum range of approximately 60 kilometres).
  • the length of the access burst is 60 bits less than the length of a normal burst, so provided the time of flight does not exceed this amount it can be received by the base station within one slot. If the mobile station is too far away, then the mobile station cannot be prevented from transmitting the access burst but it is unlikely to be decoded correctly since part of it will be interfered with by mobiles transmitting in adjacent slots. In the case of transmissions of a fast access message there is no uncertainty about time of flight, and the objective of shortening the transmit power time mask is to prevent the mobile transmitting fast access message interfering with other mobiles using the same timeslot, rather than to protect the fast access burst itself from interference from other transmissions.
  • a computing device or processor may for example be general purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, etc.
  • DSP digital signal processors
  • ASIC application specific integrated circuits
  • FPGA field programmable gate arrays
  • the various embodiments of the invention may also be performed or embodied by a combination of these devices.
  • the various embodiments of the invention may also be implemented by means of software modules, which are executed by a processor or directly in hardware. Also a combination of software modules and a hardware implementation may be possible.
  • the software modules may be stored on any kind of computer readable storage media, for example RAM, EPROM, EEPROM, flash memory, registers, hard disks, CD-ROM, DVD, etc.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
EP07021132A 2007-10-29 2007-10-29 Übertragungsleistungsmaske für Schnellzugriffsanfragen Withdrawn EP2056542A1 (de)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106572061A (zh) * 2015-10-10 2017-04-19 中兴通讯股份有限公司 无线通信基站及其数据发送方法、终端及其数据接收方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4949395A (en) * 1989-07-07 1990-08-14 Telefonaktiebolaget L M Ericsson Method and arrangement for dynamically allocating time slots to connections in a digital mobile radio system
WO2001069947A2 (en) * 2000-03-17 2001-09-20 Telefonaktiebolaget Lm Ericsson (Publ) Method and system for fast access to an uplink channel in a mobile communications network
EP1435746A1 (de) * 2002-12-31 2004-07-07 Motorola, Inc. System und Verfahren zur Kanalzuteilung in einem Kommunicationssystem
WO2007053069A1 (en) * 2005-11-01 2007-05-10 Telefonaktiebolaget Lm Ericsson (Publ) Method and arrangements in a radio communication system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4949395A (en) * 1989-07-07 1990-08-14 Telefonaktiebolaget L M Ericsson Method and arrangement for dynamically allocating time slots to connections in a digital mobile radio system
WO2001069947A2 (en) * 2000-03-17 2001-09-20 Telefonaktiebolaget Lm Ericsson (Publ) Method and system for fast access to an uplink channel in a mobile communications network
EP1435746A1 (de) * 2002-12-31 2004-07-07 Motorola, Inc. System und Verfahren zur Kanalzuteilung in einem Kommunicationssystem
WO2007053069A1 (en) * 2005-11-01 2007-05-10 Telefonaktiebolaget Lm Ericsson (Publ) Method and arrangements in a radio communication system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ETSI: "Digital cellular telecommunications system; Radio transmission and reception" GSM 05.05 version 4.23.1", EUROPEAN TELECOMM STANDARD, December 1999 (1999-12-01), XP002473865 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106572061A (zh) * 2015-10-10 2017-04-19 中兴通讯股份有限公司 无线通信基站及其数据发送方法、终端及其数据接收方法

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